JP2005183371A - Ceramic heater and manufacturing method thereof, heat exchange unit, and toilet seat with warm-water washing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ceramic heater and a manufacturing method thereof, a heat exchange unit, and a toilet seat with warm-water washing, capable of simplifying work processes and reducing the manufacturing cost. <P>SOLUTION: A ceramic heater (5) comprises a pipe-like ceramic heater body (23), and a sealing member (13) is capped over the ceramic heater body (23). A core member (25) of the ceramic heater body (23) is wound with a sheet-like heater member (27). A shielding member (33) is embedded in an attaching/fixing position T of a recess (31), between both end surfaces, and facing each other, of the heater member (27). Since the sealing member (13) is capped over the attaching/fixing position T, the sealing member (13) makes tight contact with the outer peripheral surfaces of the heater member (27) and the shielding member (33) for sealing them. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a ceramic heater, a heat exchange unit, a hot water cleaning toilet seat, and a method for manufacturing a ceramic heater used in, for example, a hot water cleaning toilet seat, an electric water heater, a 24-hour bath, and the like.

  Conventionally, for example, a warm water washing toilet seat has been used with a heat exchanger having a resin casing in order to warm the washing water. A long pipe-shaped ceramic heater is attached to the heat exchanger. It has been.

  The ceramic heater is obtained by winding a sheet-shaped ceramic heater with a built-in heater around the outer peripheral surface of a pipe-shaped ceramic base, and the center of the shaft is supplied with tap water serving as cleaning water. There is a road.

When manufacturing this kind of ceramic heater, the following method is mentioned, for example.
First, a pipe-like alumina ceramic substrate is formed by temporary firing. On the other hand, a high melting point metal such as tungsten is printed on the surface of the alumina ceramic sheet to form a heater (heater pattern).

  Next, a ceramic paste (alumina paste) is applied to the ceramic sheet, wound around the outer peripheral surface of the ceramic substrate, bonded, pressurized, and integrally fired. As a result, as shown in FIG. 12A, a ceramic heater body 1005 having a shape in which a sheet-like heater member 1003 is wound around the ceramic base 1001 is obtained.

  Next, at the mounting and fixing position on the rear end side (right side of the figure) of the ceramic heater body 1005, that is, at the position where the ceramic flange 1007 used for mounting the ceramic heater body 1005 itself to the heat exchanger is fixed. A ceramic flange 1007 is fitted outside, and a ring-shaped glass adhesive 1009 is fitted between the ceramic heater body 1005 and the flange 1007.

  Next, the glass adhesive 1009 is heated and melted to join the flange 1007 to the ceramic heater main body 1005 to manufacture the ceramic heater 1011 shown in FIG.

Thereafter, the front end side of the ceramic heater 1011 (left side of the figure: heater formation portion) is inserted into the heat exchanger 1013, and the flange 1007 is opened using the sealing material 1021 such as an O-ring. The heat exchanger unit 1019 which consists of the ceramic heater 1011 and the heat exchanger 1013 is completed by making it contact | abut to the edge part 1015 and fastening with the screw | thread 1017 (refer the cited reference 1).
JP 2002-134250 A (FIG. 2, page 3)

  However, among the above-described conventional techniques, when the ceramic sheet is wound around the ceramic substrate and fired, a gap (slit) is formed in the joint portion of the ceramic sheet after firing.

In other words, when the ceramic sheet (before firing) is wound around the ceramic substrate (after pre-firing) that is the core member, the ceramic sheet is not heated during firing even if both ends of the ceramic sheet are made to coincide with each other. A gap occurs due to shrinkage or the like. Therefore, as it is, it is not preferable in terms of sealing (airtightness and watertightness), so some measures are required.

  For example, as described above, when the glass adhesive is melted and the flange is joined, the sealing performance can be ensured, but the work of joining using the glass adhesive is necessary, which increases the number of work steps. This will increase costs.

  The present invention has been made in view of these problems, and an object of the present invention is to provide a ceramic heater, a heat exchange unit, a hot water cleaning toilet seat, and a method for manufacturing a ceramic heater that can simplify the work process and reduce the manufacturing cost. There is to do.

  (1) The invention of claim 1 is a ceramic heater comprising a ceramic heater body in which a ceramic heater member having a heating element is wound around an outer periphery of a pipe-shaped ceramic core member, and the outer peripheral surface of the core member And a shield member that fills and seals the recessed portion at a predetermined position in the axial direction of the ceramic heater body among the recessed portions formed by the opposite end surfaces of the heater member. Is the gist.

  In this invention, since the shielding member is arrange | positioned in the recessed part formed with a heater member, the sealing performance in this recessed part is ensured. Therefore, by closely fitting the outer peripheral surfaces of the heater member and the shielding member and, for example, an elastic seal member is externally fitted, the sealing performance at the externally fitted position is sufficiently ensured.

  (2) The invention of claim 2 is characterized in that the predetermined position is an attachment fixing position for fixing an attachment portion used when the ceramic heater body is attached to a heat exchanger. The main point is a ceramic heater.

This invention shows the position where the recessed part was filled with the shielding member. In addition to this mounting and fixing position, the recess may be filled.
(3) The invention of claim 3 is characterized in that the ceramic heater according to claim 2 is provided with an attachment portion for attaching the ceramic heater body to a heat exchanger at the attachment fixing position.

The present invention shows a ceramic heater having a mounting portion on the ceramic heater body described above.
(4) In the invention according to claim 4, the mounting portion is an annular seal member that has elasticity and is externally fitted to the ceramic heater body, and the seal member is shielded from the heater member and the shield at the mounting fixing position. The gist of the ceramic heater according to claim 3, wherein the ceramic heater is tightly sealed to an outer peripheral surface of the member.

In the present invention, since the seal member is in close contact with the outer peripheral surfaces of the heater member and the shielding member at the mounting and fixing position, the sealing performance at the mounting and fixing position can be sufficiently ensured.
(5) The invention of claim 5 includes a ceramic heater body in which a ceramic heater member having a heating element is wound around the outer periphery of a pipe-shaped ceramic core member, and a predetermined mounting and fixing of the ceramic heater body. In a ceramic heater provided with a mounting portion for mounting the ceramic heater body to a heat exchanger at a position, of the concave portions formed by the outer peripheral surface of the core member and the opposite end surfaces of the heater member, The concave portion includes a shielding member that fills and seals the concave portion, and the mounting portion includes an annular sealing member that has elasticity and is externally fitted to the ceramic heater body, and the sealing member is located at the mounting fixing position. A gist of a ceramic heater, wherein the heater member and the shielding member are tightly sealed to the outer peripheral surface and sealed. That.

  In the present invention, since the shielding member is disposed in the concave portion formed by the heater member, the sealing performance in the concave portion is ensured, and the sealing member is in close contact with the outer peripheral surface of the heater member and the shielding member and has elasticity. Because of the external fitting, the sealing performance at the mounting portion is sufficiently ensured.

Further, according to the present invention, since the work of melting the glass adhesive and joining the flanges is not required as in the prior art, the number of work steps can be reduced and the cost can be reduced.
For example, a cylindrical heater body can be adopted as the ceramic heater body. As the heater member, a heater pattern as a heating element is formed on the front end side (side inserted into the heat exchanger), and a terminal pattern is formed on the rear end side (side located outside the heat exchanger). Things. As the sealing member, for example, a rubber packing made of a material such as heat-resistant fluoro rubber or an O-ring can be employed. Here, the seal means an airtight and watertight state (the same applies hereinafter).

  (6) The invention according to claim 6 is characterized in that the shielding member is a ceramic member, a resin member, or a glass member.

  The present invention exemplifies a shielding member. For example, a member made of the same material as the heater member is preferably used as the shielding member because it has high adhesion when fired integrally. Further, when a resin member is used, there is an advantage that the manufacturing method can be further simplified because a resin material may be filled in the concave portion of the fired ceramic heater body. Furthermore, it is also possible to fill the recess by melting the glass material.

  (7) The invention of claim 7 includes a ceramic heater body in which a ceramic heater member having a heating element is wound around the outer periphery of a pipe-shaped ceramic core member, and a predetermined mounting and fixing of the ceramic heater body. In a ceramic heater provided with a mounting portion for mounting the ceramic heater body to a heat exchanger at a position, of the concave portions formed by the outer peripheral surface of the core member and the opposite end surfaces of the heater member, An annular seal that includes a shielding member that fills and seals the recess and protrudes in an outer circumferential direction from the outer circumferential surface of the heater member, and that has an elasticity and is externally fitted to the ceramic heater body as the mounting portion. A seal member, and the seal member is closely attached to an outer peripheral surface of the heater member and an outer surface of the shielding member at the mounting and fixing position And gist ceramic heater, characterized in that the sealing with.

  In the present invention, since the shielding member is disposed in the concave portion formed by the heater member, the sealing performance in the concave portion is ensured, and the outer peripheral surface of the heater member and the protruding outer surface of the shielding member are in close contact with each other. Since the elastic sealing member is fitted, the sealing performance at the mounting portion is sufficiently ensured.

  Moreover, in this invention, since the shielding member protrudes from the outer peripheral surface of a heater member, this protrusion part can be used for positioning of a ceramic heater. In other words, when the ceramic heater is attached to the heat exchanger, the leading end side (in the insertion direction) of the protruding portion abuts on the end of the heat exchanger, whereby positioning in the insertion direction can be performed. In addition, by providing a fitting recess (for example, a width approximately the same as the plate thickness) into which the protruding portion fits in the heat exchanger, the ceramic heater is prevented from moving in the rotational direction and positioned in the rotational direction. be able to.

Furthermore, in the present invention, unlike the prior art, it is not necessary to melt the glass adhesive and join the flange, so that the number of work steps can be reduced and the cost can be reduced.
(8) The invention of claim 8 is characterized in that an end portion (for example, a portion constituting one side) in the outer peripheral direction of the shielding member is inclined obliquely along the axial direction of the core member. Item 10 is a ceramic heater according to Item 7.

  The present invention exemplifies the shape of the protruding shielding member. Here, when the tip side (the side arranged in the heat exchanger) is inclined low, the work of attaching the ceramic heater to the heat exchanger, that is, the work of fitting the shielding member into the fitting recess on the heat exchanger side Is preferable because it is easy. On the other hand, when the rear end side (side arranged outside the heat exchanger) is slanted, the ceramic heater body attached to the heat exchanger may receive pressure outward due to the water pressure inside the heat exchanger. It is preferable that the rear end side (however, the rear end side of the shielding member is encased in the seal member) or a portion with a higher end on the outer peripheral side hits the seal member and can effectively prevent the dropout.

  (9) The invention according to claim 9 is characterized in that a part of the shielding member is fitted to the seal member, and the other part protrudes from the seal member to the tip side of the ceramic heater body. The gist of the ceramic heater according to claim 7 or 8.

  The present invention illustrates the positional relationship between the shielding member and the sealing member. In the present invention, among the protruding portions of the shielding member, for example, the distal end side thereof protrudes from the seal member. Therefore, the positioning described above can be performed by fitting the distal end side into, for example, the fitting recess of the heat exchanger.

  In addition, when the rear end side of the projecting portion of the shielding member is covered with the sealing member, the sealing performance is high, and the rear end side of the projecting portion is sealed even when the ceramic heater body is pressed by water pressure. Since it hits the member, the ceramic heater body can be prevented from falling off.

  (10) The invention of claim 10 includes a ceramic heater body in which a ceramic heater member having a heating element is wound around the outer periphery of a pipe-shaped ceramic core member, and a predetermined mounting and fixing of the ceramic heater body. In a ceramic heater provided with a mounting portion for mounting the ceramic heater body to a heat exchanger at a position, the mounting portion is provided with an annular seal member that has elasticity and is externally fitted to the ceramic heater body. A convex portion is provided on the inner peripheral surface of the core member, and the convex portion of the seal member is fitted in the concave portion at the mounting fixing position among the concave portions formed by the outer peripheral surface of the core member and the opposite end faces of the heater member. And the sealing member is tightly sealed to the outer peripheral surface of the heater member and the inner surface of the recess. The heater and the spirit.

  The present invention includes an inner side surface of a concave portion by fitting an elastic seal member such as rubber having a convex portion on the inner peripheral surface to the ceramic heater body and fitting the convex portion to the concave portion. It is the structure which seals the whole outer peripheral surface of a ceramic heater main body.

In addition, the present invention has an advantage that the manufacturing process of the ceramic heater is further simplified because the sealing member may be fitted to the fired ceramic heater body.
(11) The invention of claim 11 is characterized in that the ceramic heater according to any one of claims 3 to 10 is attached to the heat exchanger using a fixing member that engages with the attachment portion. The gist of the heat exchange unit.

  In the present invention, for example, the ceramic heater can be easily fixed to the heat exchanger by fitting an annular fixing member from the rear end side of the ceramic heater and pressing the seal member toward the heat exchanger.

  (12) The invention of claim 12 attaches the ceramic heater according to any of claims 7 to 9 to the heat exchanger using a fixing member that engages with the attachment portion, and attaches the ceramic heater to the heat exchanger. Is a gist of a heat exchange unit including a fitting recess into which the shielding member is fitted.

  In the present invention, since the fitting recess is provided in the heat exchanger, the ceramic heater can be easily positioned by fitting the protruding portion of the shielding member into the fitting recess when the ceramic heater is attached to the heat exchanger. It can be carried out.

  (13) The invention according to claim 13 is characterized in that the fixing member has an end portion of the heat exchanger in a state where the sealing member of the ceramic heater is sandwiched between the fixing member itself and the end portion of the heat exchanger. The gist of the heat exchanging unit according to claim 11 or 12, which is a member for fixing the ceramic heater by engaging with and pressing the seal member.

  In the present invention, when the ceramic heater is attached to the heat exchanger (with the heated portion of the ceramic heater disposed in the heat exchanger), the heat exchanger and the fixing member (for example, an annular shape that is externally fitted to the ceramic heater) The seal member is sandwiched between them, for example, the end of the heat exchanger and the fixing member are screwed together and the seal member is tightened to ensure the sealing performance of the portion, and the ceramic heater can be easily attached to the heat exchanger. Can be fixed to.

(14) The invention of claim 14 is summarized in a warm water washing toilet seat comprising the heat exchange unit according to any one of claims 11 to 13.
The present invention exemplifies a warm water washing toilet seat provided with the heat exchange unit described above.

  (15) The invention of claim 15 is the method for producing a ceramic heater comprising a ceramic heater body in which a ceramic heater member having a heating element is wound around an outer periphery of a pipe-shaped ceramic core member. Of the recesses formed by the outer peripheral surface of the member and the opposite end surfaces of the heater member, the ceramic before firing through a ceramic paste so as to fill the recesses at predetermined positions in the axial direction of the ceramic heater body The gist of the method is a method for producing a ceramic heater, wherein the compact is disposed and fired.

  In the present invention, for example, the ceramic molded body before firing is disposed and fired through the ceramic paste in the recess formed by the outer peripheral surface of the temporarily fired core member and the unfired heater member (for example, green sheet). Therefore, it is not necessary to join the flange with glass as in the prior art. Therefore, the work process can be simplified and the cost can be reduced.

As the ceramic molded body, for example, an unfired ceramic sheet such as a green sheet, or a pre-fired molded body obtained by press-molding ceramic powder can be employed.
(16) According to a sixteenth aspect of the present invention, there is provided a method for manufacturing a ceramic heater including a ceramic heater body in which a ceramic heater member having a heating element is wound around an outer periphery of a pipe-shaped ceramic core member. Of the recesses formed by the outer peripheral surface of the core member and the opposite end surfaces of the heater member, the recesses at predetermined positions in the axial direction of the ceramic heater body are filled with a ceramic paste so as to fill the recesses and fired. The gist of the manufacturing method of the ceramic heater is as follows.

  In the present invention, for example, a ceramic paste is filled and fired in a recess formed by the outer peripheral surface of a pre-fired core member and an unfired heater member (for example, a green sheet). Bonding is not necessary. Therefore, the work process can be simplified and the cost can be reduced.

  (17) According to a seventeenth aspect of the present invention, there is provided a ceramic heater manufacturing method comprising a ceramic heater body in which a ceramic heater member having a heating element is wound around an outer periphery of a pipe-shaped ceramic core member. After forming the heater member, the recess is formed in a recess at a predetermined position in the axial direction of the ceramic heater body among the recesses formed by the outer peripheral surface of the core member and the opposite end surfaces of the heater member. A gist is a method for manufacturing a ceramic heater, which is filled with a heat-resistant resin or a resin added with a ceramic material.

  In the present invention, for example, after wrapping an unfired heater member (for example, a green sheet) around the outer peripheral surface of the pre-fired core member and firing, the recess formed by the outer peripheral surface of the fired core member and the heater member, Since a heat-resistant resin or a resin to which a ceramic material is added is filled, not only the conventional joining of the flange with glass but also the operation of firing the filled material as described above is unnecessary. Therefore, the work process can be further simplified and the cost can be greatly reduced.

  As the heat-resistant resin, for example, an epoxy resin can be adopted, and as the resin to which a ceramic material is added, an epoxy resin to which a ceramic powder similar to the heater member is added can be adopted.

  (18) The invention of claim 18 is a method of manufacturing a ceramic heater comprising a ceramic heater body in which a ceramic heater member having a heating element is wound around the outer periphery of a pipe-shaped ceramic core member. After forming the heater member, the recess is formed in a recess at a predetermined position in the axial direction of the ceramic heater body among the recesses formed by the outer peripheral surface of the core member and the opposite end surfaces of the heater member. A gist is a method for manufacturing a ceramic heater, which is filled with a glass material and fired.

  In the present invention, for example, after wrapping an unfired heater member (for example, a green sheet) around the outer peripheral surface of the pre-fired core member and firing, the recess formed by the outer peripheral surface of the fired core member and the heater member, For example, a glass material such as a glass paste can be filled, and the glass material can be fired to form a glass member that is a shielding member.

  (19) The invention according to claim 19 is characterized in that the predetermined position is an attachment fixing position for fixing an attachment portion used when the ceramic heater body is attached to a heat exchanger. The manufacturing method of the ceramic heater according to any one of the aspects is summarized.

The present invention shows a mounting fixing position for fixing the mounting portion.
(20) The method of manufacturing a ceramic heater according to claim 19, wherein the mounting portion is mounted at the mounting and fixing position after the shielding member is formed by filling the concave portion. The gist.

  Thereby, the ceramic heater which fixed the attaching part to the ceramic heater main body can be manufactured.

  Next, an example (example) of the best mode of the present invention will be described.

a) First, the ceramic heater and heat exchange unit of this embodiment will be described.
The heat exchange unit of the present embodiment is used for warming washing water in a warm water washing toilet seat. As shown in FIG. 1, the heat exchange unit 1 includes a heat exchanger 3 that contains cleaning water, a ceramic heater 5 that is attached to the heat exchanger 3 and warms the cleaning water, and the ceramic heater 5 is connected to the heat exchanger 3. And a fixing member 7 to be fixed to.
The heat exchanger 3 is, for example, a resin container made of nylon to which glass is added, a circular opening 9 into which the ceramic heater 5 is inserted, and a cylindrical fixing portion 11 to which the ceramic heater 5 is fixed. It has.

  As shown in an exploded view in FIG. 2, the opening end 12 of the fixing portion 11 is formed in a taper shape so that the seal member 13 is in contact with the fixing portion 11. A screw portion 17 into which the member 7 is screwed is formed.

  The fixing member 7 is an annular lid having a through hole 19 that matches the outer shape of the ceramic heater 5, and one end side (the right side in FIG. 2: the rear end side) of the inner peripheral surface is an annular seal member 13. A threaded portion 21 that is screwed into the threaded portion 17 of the fixed portion 11 is formed on the other end side (the left side in FIG. 2: the front end side) of the inner peripheral surface.

  As shown in FIG. 3A, the ceramic heater 5 includes a long pipe-shaped ceramic heater main body 23 made of alumina. The seal member 13 made of fluororubber is externally fitted. The seal member 13 is an annular elastic member having a trapezoidal cross section along the axial center (see FIGS. 3B and 3C).

  The ceramic heater body 23 is obtained by winding an alumina sheet-like heater member 27 around an outer peripheral surface of an alumina core member 25. A heater (not shown) to be accommodated is built in, and a pair of heater terminals 29 disposed outside the heat exchanger 3 are formed on the rear end side.

  When the heater member 27 is formed by being wound around the core member 25, a gap (slit) is generated by being sandwiched between the opposite end faces, so that the outer peripheral surface of the core member 25 is the bottom. ) A recess 31 is formed. In the recess 31, an alumina shielding member 33 is embedded in a portion between the heater and the heater terminal 29 (that is, the mounting fixing position T where the seal member 13 is fitted). It is.

  That is, the inside of the recess 31 is sealed (watertight and airtight) by the shielding member 33, and the outer peripheral surface of the ceramic heater main body 23 at the mounting and fixing position T is filled with the recess 31 to be a perfect circle. When the inner peripheral surface of the seal member 13 is in close contact with the outer peripheral surface (that is, the outer peripheral surface of the heater member 27 and the shielding member 33), the sealing is securely performed so that no gap is generated between the ceramic heater body 23 and the outer peripheral surface. That is, due to the elasticity of the seal member 13, the seal member 13 is in close contact with the ceramic heater main body 23 and is an integral member without a gap.

In addition, the attachment part which attaches the ceramic heater 5 itself to the heat exchanger 3 is comprised by the seal member 13 fitting externally in the said attachment fixing position T.
Therefore, in the heat exchange unit 1 having the above-described configuration, as shown in FIG. 1, tap water is introduced in the direction of arrow A, and the tap water passes through the internal through-hole (see FIG. (Not shown) and out from the tip side. And when the tap water passes a through-hole, while being heated by a heater, temperature rises, and the tap water around the ceramic heater 5 is also heated by a heater, and functions so that temperature rises.

b) Next, the manufacturing method of the present embodiment will be described.
-First, the manufacturing method of the ceramic heater main body 23 is demonstrated.
For example, an alumina-based (alumina 90% by weight or more) ceramic sheet (green sheet) is manufactured by a doctor blade method.

  Next, a refractory metal such as tungsten is printed on one surface of the ceramic sheet to form a heater pattern that becomes a heating element (not shown). Similarly, a terminal pattern to be a heater terminal is formed on the other surface, and the terminal pattern and the heater pattern are connected through a through hole.

  The heater pattern is formed on one side of the ceramic sheet, that is, on the front end side of the heater member 27 so as to be disposed inside the heat exchanger 3, and the terminal pattern is disposed outside the heat exchanger 3. As shown, the heater member 27 is formed on the rear end side.

Next, another ceramic sheet is laminated so as to cover the heater pattern to form a laminate of ceramic sheets.
Next, as shown in FIGS. 4A and 4B, a ceramic paste (not shown) is formed by adding a solvent to the same material as the ceramic sheet 41 on one surface of the ceramic sheet 41 of the laminate. Apply). Then, the ceramic sheet 41 is wound around the outer peripheral surface of the calcined alumina core member 25 with the coated surface facing the core member 25 side. At this time, the opposite end faces of the wound ceramic sheet 41 are close to each other, but there is a slight gap (for example, a gap having a width of 0.5 to 3 mm), and this gap (and the outer periphery of the core member 25 serving as the bottom face thereof). The concave portion 31 is formed by the surface.

  4C, a ceramic sheet made of the same material as that of the ceramic sheet 41 is cut into a width so as to fill the concave portion 31 to form a strip shape that becomes the shielding member 33. A sheet piece 43 is created. The thickness of the sheet piece 43 is the same as that of the ceramic sheet 41.

  4D, a ceramic paste 45 made by adding a solvent to the same material as the ceramic sheet 41 is applied to the bottom surface and both side surfaces of the sheet piece 43, and the concave portion Of the 31, the sheet piece 43 is pressed against the recessed portion 31 at the mounting and fixing position T to fill the recessed portion 31.

  Next, in a state where the ceramic sheet 41 and the sheet piece 43 are disposed on the outer peripheral surface of the core member 25, the core member 25 and the ceramic sheet are heated in a reducing atmosphere at a temperature of 1400 to 1600 ° C. for 10 to 13 hours. 41 and the sheet piece 43 are integrally fired.

  As a result, as shown in FIG. 4E, the shielding member 33 is disposed in the ceramic heater main body 23 in which the heater member 27 is wound around the core member 25, more specifically, in the recess 31 at the mounting fixing position T. A perfect circular ceramic heater main body 23 having no recess 31 at the mounting and fixing position T is obtained.

-Next, the manufacturing method of the heat exchange unit 1 grade | etc., Is demonstrated.
As shown in FIG. 2, the ceramic heater 5 is obtained by externally fitting the seal member 13 to the ceramic heater body 23 manufactured by the above-described method and disposing the seal member 13 at the mounting and fixing position T. Since there is no recess 31 at the mounting and fixing position T, the seal member 13 is in close contact with the outer peripheral surfaces of the heater member 27 and the shielding member 33.

Next, the ceramic heater 5 is inserted into the heat exchanger 3 with the heater side first, and the seal member 13 is brought into contact with the fixing portion 11 of the heat exchanger 3.
Next, the fixing member 7 is externally fitted from the rear end side of the ceramic heater 5 and the sealing member 13 is sandwiched (between the heat exchanger 3) and the screw portion 21 of the fixing member 7 and the heat exchanger. 3 screw part 17 is screwed and tightened. Thereby, the ceramic heater 5 is fixed to the heat exchanger 3, and the heat exchange unit 1 is completed.

c) Thus, in this embodiment, the unfired ceramic sheet 41 is applied to the temporarily fired core member 25.
Since the sheet piece 43 coated with the ceramic paste 45 is embedded in the recess 31 (at the mounting fixing position T) due to the gap between the both end faces of the ceramic sheet 41 and integrally fired, the mounting of the completed ceramic heater body 23 is performed. There is no recess 31 at the fixed position T.

Therefore, by sealingly fitting the seal member 13 to the mounting and fixing position T, the gap between the ceramic heater body 23 and the seal member 13 can be reliably sealed.
In particular, in the case of the present embodiment, there is no need to seal with glass as in the prior art, so there is no need to heat and fuse the glass, the work man-hours can be greatly reduced, and the cost is reduced. This also has the effect of greatly contributing to the reduction.

  Further, as the sealing member 13, since the annular sealing member 13 (or a rubber O-ring) or the like that is normally used for other purposes can be used, the cost can be reduced also from that point. can do.

Furthermore, when fixing the ceramic heater 5 to the heat exchanger 3, it is only necessary to tighten the fixing member 7, so that the fixing is very easy.
In addition, since the elastic seal member 13 is disposed between the heat exchanger 3 and the fixing member 7 and is tightened, the space between the heat exchanger 3 and the ceramic heater 5 is surely airtight. can do.

Next, the second embodiment will be described, but the description of the same contents as the first embodiment will be omitted.
Since this embodiment is different from the first embodiment in the method of filling the recesses, this point will be described.

  As shown in FIG. 5A, when the ceramic heater of the present embodiment is manufactured, first, an unfired (heater member 59) is formed on the outer peripheral surface of a pre-fired pipe-like alumina core member 51. Wrap an alumina ceramic sheet 53.

At this time, the opposite end faces of the wound ceramic sheet 53 are close to each other, but there is a slight gap, and the recess 55 is formed by this gap.
Next, the recess 55 is filled with a ceramic paste (alumina paste) 57 made of the same material as that of the ceramic sheet 53 (to be the shielding member 63), and the recess 55 is filled. At this time, the top surface of the filled paste is pressed and shaped so as to be the same as the top surface of the ceramic sheet 53.

Thereafter, as in the first embodiment, the core member 51, the ceramic sheet 53, and the ceramic paste 57 are integrally fired under predetermined firing conditions.
As a result, as shown in FIG. 5B, the ceramic heater main body 61 in which the heater member 59 is wound around the core member 51, more specifically, the shielding member 63 is disposed in the concave portion 55 at the mounting fixing position T. A perfect circular ceramic heater main body 61 having no recess 55 at the mounting and fixing position T is obtained.

  A ceramic heater is formed by externally fitting a seal member (not shown) to the ceramic heater body 61 thus obtained, and the ceramic heater is attached to a heat exchanger to obtain a heat exchange unit.

  Also in this embodiment, the same effects as those of the first embodiment can be obtained, and there is an advantage that the work process can be further simplified since the sheet piece is not used.

Next, the third embodiment will be described, but the description of the same contents as the second embodiment will be omitted.
In the present embodiment, although not shown in particular, a ceramic heater body is used in which an unfired ceramic sheet (to be a heater member) is wound around a prefired core member and fired.

  Of the recesses formed by the both end surfaces of the heater member, the recesses at the mounting and fixing positions are filled with a heat-resistant resin such as an epoxy resin to fill the recesses and harden to seal the recesses.

  After that, a sealing member is externally fitted at the mounting and fixing position of the ceramic heater body, and the sealing member is brought into close contact with the outer peripheral surface of the heater member and the outer surface of the portion (resin member) formed by filling with resin. Ensures sealing performance at the position.

  In this embodiment, the same effects as those of the second embodiment can be obtained, and the operation of baking and integrating the ceramic sheet and the ceramic paste is unnecessary, so that the manufacturing process can be further simplified and the cost can be further reduced. There is an advantage.

  In addition, it can replace with resin, such as the said epoxy resin, and can also use resin which added ceramic powder.

Next, the fourth embodiment will be described, but the description of the same contents as the first embodiment will be omitted.
In this embodiment, unlike the first embodiment, a shielding member that protrudes outward from the outer peripheral surface of the heater member is formed.

a) First, the structure of the ceramic heater of the present embodiment will be described.
As shown in FIGS. 6A and 6B, the recess 73 at the mounting and fixing position T of the ceramic heater main body 71 used in this embodiment has a shielding member 75 (an enlarged view of FIG. 6C). )) Is established.

  That is, one of the long sides of the shielding member 75 is fitted into the recess 73 and protrudes outward from the outer peripheral surface of the heater member 77 so as to coincide with a plane including the axial center of the ceramic heater body 71.

  On the other hand, as shown in an enlarged view in FIG. 7, a seal-side concave portion in which the rear end side (the right side of the drawing) of the shielding member 75 is fitted and closely attached to the seal member 79 that is externally fitted to the ceramic heater body 71. 81 is provided. At this time, the distal end side (left side in the figure) of the protruding portion of the shielding member 75 protrudes toward the distal end side of the ceramic heater main body 71.

  Further, the fixing portion 85 of the heat exchanger 83 is also provided with a fitting recess 87 into which the distal end side (left side in the figure) of the protruding portion of the shielding member 75 is fitted. The concave shape of the fitting concave portion 87 is the same shape as the outer shape of the shielding member 75.

b) Next, the manufacturing method of the present embodiment will be described.
When the ceramic heater 89 of the present embodiment is manufactured, first, as shown in FIG. 8, the non-fired (heater member 77 (FIG. 7))) is wound.

At this time, the opposite end surfaces of the wound ceramic sheet 95 are close to each other, but there is a slight gap, and the recess 73 is formed by this gap.
Further, a ceramic sheet made of the same material as that of the ceramic sheet 95 and having a thickness that fits into the concave portion 73 is cut to form a rectangular sheet piece 97 that becomes the shielding member 75.

  Then, a ceramic paste 99 made of a material similar to that of the ceramic sheet 95 and a solvent is applied to the bottom surface of the sheet piece 97 and both side surfaces, and is fitted into the recess 73.

Thereafter, as in the first embodiment, the core member 91, the ceramic sheet 95, and the sheet piece 97 are integrally fired under predetermined firing conditions.
As a result, as shown in FIG. 6, the shielding member 75 is disposed in the ceramic heater body 71 in which the heater member 77 is wound around the core member 91, more specifically, the recess 73 at the mounting fixing position T, and the shielding member A ceramic heater body 71 in which 75 projects from the outer peripheral surface of the heater member 77 is obtained.

  As shown in FIG. 7, the sealing member 79 is fitted on the ceramic heater main body 71 thus obtained at the mounting and fixing position T to form a ceramic heater 89. At this time, the rear end side of the shielding member 75 is fitted into the seal-side recess 81 of the seal member 79.

  And while inserting the front end side of this ceramic heater 89 in the inside of the heat exchanger 83, the front end side of the shielding member 75 is inserted in the fitting recessed part 87, and the fixing member 101 is screwed and fixed. Thereby, the ceramic heater 89 is attached to the heat exchanger 83, and the heat exchange unit 103 is completed.

  c) In this embodiment, the same effect as in the first embodiment is obtained, and the shielding member 75 protrudes to the outside, so that the ceramic heater 89 can be easily positioned when it is fixed to the heat exchanger 83. Can do.

  That is, the front end side of the shielding member 75 is fitted in the fitting recess 87 of the heat exchanger 83, whereby positioning in the insertion direction (the axial direction of the ceramic heater 89) can be performed and the rotation direction of the ceramic heater 89 is also achieved. Positioning can also be performed.

  In particular, since the ceramic heater 89 has the recess 73, the heater arrangement pattern is not uniform. Therefore, it is preferable to position the ceramic heater 89 in the rotational direction, but in this embodiment, the rotational direction is as described above. Can be easily positioned.

  In this embodiment, since the rear end side of the shielding member 75 is covered with the sealing member 79, even when the ceramic heater body 71 receives pressure in the direction of dropping from the heat exchanger 83 due to water pressure, the sealing member 79. Has the advantage of functioning as a stopper.

  Further, in this embodiment, the sealing performance of the recess 73 at the mounting and fixing position T can be realized by the lower part of the shielding member 75 fitted in the recess 73, and the shielding member protruding from the outer peripheral surface of the heater member 77. With respect to the upper portion of 75, the sealing member 79 is brought into close contact with the outside, so that the sealing performance can be ensured.

  In this embodiment, the rear end side of the shielding member 75 is covered with the seal member 79 and is not exposed to the outside, but separately, the rear end side of the shielding member 75 penetrates the seal member 79. It is good also as a structure exposed outside. Also in this case, since the outer surface of the shielding member 75 is in close contact with the inner peripheral surface of the seal-side recess 81 of the seal member 79, the sealing performance can be ensured.

Next, the fifth embodiment will be described, but the description of the same contents as the fourth embodiment will be omitted.
In the ceramic heater of the present embodiment, the shape of the shielding member is different from that of the fourth embodiment.
As shown in FIGS. 9A and 9B, the ceramic heater main body 101 in this embodiment has a heater member 105 wound around the outer peripheral surface of the core member 103, and a gap formed by the heater member 105. Therefore, the shielding member 109 is fitted in the recess 107.

  The shielding member 109 has a shape in which one end side of a rectangular plate is inclined obliquely as shown in an enlarged view of FIG. That is, the upper part 111 of the shielding member 109 is lowered toward the tip side (the side inserted into the heat exchanger: the left side of the figure).

  Further, in the method for manufacturing a ceramic heater according to the present embodiment, although not shown, an unfired ceramic sheet (which becomes the heater member 105) is wound around the outer peripheral surface of the core member 103 which has been pre-fired, as in the fourth embodiment. A ceramic paste is applied to the bottom surface of the unfired sheet piece (to be the shielding member 109) and the bottom surface of both side surfaces, and is fitted into the recess 107, and the core member 103, the ceramic sheet, and the sheet are subjected to predetermined firing conditions. The piece is integrally fired.

  As a result, the shielding member 109 is disposed in the recess 107 at the mounting and fixing position T, and the ceramic heater body 101 in which the shielding member 109 protrudes from the outer peripheral surface of the heater member 105 is obtained.

Thereafter, a ceramic heater is formed by fitting a sealing member on the rear end sides of the ceramic heater body 101 and the shielding member 109.
In the present embodiment, the same effect as in the fourth embodiment is obtained, and the upper portion 111 of the shielding member 109 is inclined so as to become lower toward the tip side, so that the work of mounting the ceramic heater on the heat exchanger, that is, There is an advantage that the operation of fitting the distal end side of the shielding member 109 into the fitting recess is easy.

  Apart from this embodiment, the upper part of the shielding member may be inclined so as to become lower toward the rear end side. In this case, it is effective when the rear end side of the shielding member penetrates the seal member and is exposed to the outside. That is, since the upper end side of the upper part of the shielding member is higher, there is an effect that even when the ceramic heater body is subjected to water pressure in the direction of dropping, it is difficult to come off.

Next, the sixth embodiment will be described, but the description of the same contents as the first embodiment will be omitted.
In the ceramic heater of the present embodiment, the shape of the sealing member is different from that of the first embodiment.
As shown in FIG. 10A, in the ceramic heater 121 of the present embodiment, a heater member 125 is wound around the outer peripheral surface of the core member 123 to constitute a ceramic heater body 127, and this (fired) ceramic is formed. An annular seal member 129 having elasticity is fitted into the heater main body 127.

  That is, as shown in FIG. 10B, a convex portion 133 is formed along the axial direction on the inner peripheral surface of the annular seal member 129, and the seal member 129 is fitted into the ceramic heater main body 127. At this time, the convex 133 is fitted into the concave 135.

Therefore, the convex portion 133 functions in the same manner as the shielding member of the first embodiment, and seals the concave portion 135.
Also in this embodiment, the same effects as those of the first embodiment are obtained, and the operation of baking and integrating the shielding member as in the first embodiment is unnecessary, so that the work process can be further simplified. .

In addition, this invention is not limited to the said Example at all, and it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from the summary of this invention.
(1) For example, in the manufacturing method in each of the above-described embodiments, the core member that is an object to be wound with an unfired ceramic sheet (to be a heater member) is preliminarily fired so that the operability at the time of manufacture and the heater member are Although the adhesiveness is compatible, the core member may be unfired or fired. In addition, when filling the resin etc. of the said Example 3, the ceramic heater main body which is the object filled with resin is baked.

  (2) Also, as shown in FIG. 11, when an unfired ceramic sheet (to be a heater member 143) is wound around the core member 141, a ceramic paste is applied to one surface of the ceramic sheet. In this case, the ceramic paste may ooze into the recess 145 and fill the recess 145. Therefore, the shielding member 147 that fills the concave portion 145 can be formed by subsequent firing.

It is explanatory drawing which fractures | ruptures and shows the heat exchange unit of Example 1. FIG. It is explanatory drawing which fractures | ruptures, expands, and decomposes | disassembles and shows a part of heat exchange unit of Example 1. FIG. (A) is a top view which shows the ceramic heater of Example 1, (b) is a right side view which shows a sealing member, (c) is the AA sectional drawing. (A) is a top view which shows the ceramic heater main body without the shielding member of Example 1, (b) is the right view, (c) is a perspective view of a sheet piece, (d) is the manufacturing procedure of a ceramic heater main body. Explanatory drawing which shows, (e) is a top view which shows a ceramic heater main body. (A) is explanatory drawing which shows the manufacturing procedure of the ceramic heater main body of Example 2, (b) is a top view which shows a ceramic heater main body. (A) is a top view which shows the ceramic heater main body of Example 4, (b) is a front view which shows a ceramic heater main body, (c) is a front view which shows a shielding member. It is explanatory drawing which fractures | ruptures, expands, and decomposes | disassembles and shows a part of heat exchange unit of Example 4. FIG. It is explanatory drawing which shows the manufacture procedure of the ceramic heater main body of Example 4. (A) is a top view which shows the ceramic heater main body of Example 5, (b) is a front view which shows a ceramic heater main body, (c) is a front view which shows a shielding member. (A) is a top view which decomposes | disassembles and shows the ceramic heater of Example 6, (b) is a right view which expands and shows the sealing member. It is explanatory drawing which shows the cross section of the ceramic heater main body of the other Example. (A) is explanatory drawing which shows the manufacturing procedure of the ceramic heater of a prior art, (b) is explanatory drawing which fractures | ruptures and shows a heat exchange unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,103 ... Heat exchange unit 3, 83 ... Heat exchanger 5, 121 ... Ceramic heater 7, 101 ... Fixing member 13, 79, 129 ... Seal member 23, 61, 71, 101, 127 ... Ceramic heater main body 25, 51 91, 103, 123, 141 ... Core member 27, 59, 77, 105, 125, 143 ... Heater member 31, 55, 73, 107, 135, 145 ... Recess 33, 63, 75, 109, 147 ... Shielding member 41, 53, 95 ... Ceramic sheet 43, 97 ... Sheet piece 45, 57, 99 ... Ceramic paste T ... Mounting fixing position

Claims (20)

In a ceramic heater including a ceramic heater body in which a ceramic heater member having a heating element is wound around the outer periphery of a pipe-shaped ceramic core member,
Among the recesses formed by the outer peripheral surface of the core member and the opposite end surfaces of the heater member, a shielding member that fills and seals the recesses in the recesses at predetermined positions in the axial direction of the ceramic heater body is provided. Ceramic heater characterized by   The ceramic heater according to claim 1, wherein the predetermined position is an attachment fixing position for fixing an attachment portion used when the ceramic heater body is attached to a heat exchanger.   The ceramic heater according to claim 2, further comprising an attachment portion for attaching the ceramic heater body to a heat exchanger at the attachment fixing position.   The mounting portion is an annular seal member that has elasticity and is fitted around the ceramic heater body, and the seal member is in close contact with the outer peripheral surfaces of the heater member and the shielding member at the mounting fixing position. The ceramic heater according to claim 3, wherein: A ceramic heater body is provided with a ceramic heater member having a heating element wound around the outer periphery of a pipe-shaped ceramic core member, and the ceramic heater body is heat-exchanged at a predetermined mounting and fixing position of the ceramic heater body. In a ceramic heater with a mounting part to be attached to the vessel,
Among the recesses formed by the outer peripheral surface of the core member and the opposite end surfaces of the heater member, the recess at the mounting fixing position is provided with a shielding member that fills and seals the recess, and the mounting portion is elastic. An annular seal member that is externally fitted to the ceramic heater body,
The ceramic heater, wherein the seal member is tightly sealed to the outer peripheral surfaces of the heater member and the shielding member at the mounting and fixing position.   The ceramic heater according to any one of claims 1 to 5, wherein the shielding member is a ceramic member, a resin member, or a glass member. A ceramic heater body is provided with a ceramic heater member having a heating element wound around the outer periphery of a pipe-shaped ceramic core member, and the ceramic heater body is heat-exchanged at a predetermined mounting and fixing position of the ceramic heater body. In a ceramic heater with a mounting part to be attached to the vessel,
Of the recesses formed by the outer peripheral surface of the core member and the opposite end surfaces of the heater member, the recesses at the mounting and fixing positions are sealed by filling the recesses and projecting outward from the outer peripheral surface of the heater member. And further includes an annular sealing member that has elasticity and is externally fitted to the ceramic heater body, as the mounting portion.
The ceramic heater, wherein the seal member is tightly sealed to the outer peripheral surface of the heater member and the outer surface of the shielding member at the mounting and fixing position.   The ceramic heater according to claim 7, wherein an end portion of the shielding member in an outer peripheral direction is inclined obliquely along an axial direction of the core member.   9. The shielding member according to claim 7 or 8, wherein a part of the shielding member is fitted to the sealing member, and another part of the shielding member protrudes from the sealing member to a tip side of the ceramic heater body. Ceramic heater. A ceramic heater body is provided with a ceramic heater member having a heating element wound around the outer periphery of a pipe-shaped ceramic core member, and the ceramic heater body is heat-exchanged at a predetermined mounting and fixing position of the ceramic heater body. In a ceramic heater with a mounting part to be attached to the vessel,
As the mounting portion, an annular seal member that has elasticity and is fitted around the ceramic heater body is provided, and a convex portion is provided on the inner peripheral surface of the seal member,
Of the recesses formed by the outer peripheral surface of the core member and the opposite end surfaces of the heater member, the projection of the seal member is fitted into the recess at the mounting and fixing position, and the seal member is A ceramic heater characterized in that the outer peripheral surface and the inner surface of the recess are in close contact and sealed.   A heat exchange unit, wherein the ceramic heater according to any one of claims 3 to 10 is attached to the heat exchanger using a fixing member that engages with the attachment portion.   The ceramic heater according to any one of claims 7 to 9 is attached to the heat exchanger using a fixing member that engages with the attachment portion, and the fitting for fitting the shielding member into the heat exchanger. A heat exchanging unit characterized in that it has a concavity.   The fixing member engages with the end portion of the heat exchanger and presses the sealing member with the sealing member of the ceramic heater sandwiched between the fixing member itself and the end portion of the heat exchanger. The heat exchange unit according to claim 11 or 12, wherein the heat exchange unit is a member for fixing the ceramic heater.   A warm water washing toilet seat comprising the heat exchange unit according to any one of claims 11 to 13. In the manufacturing method of a ceramic heater provided with a ceramic heater body in which a ceramic heater member having a heating element is wound around the outer periphery of a pipe-shaped ceramic core member,
Of the recesses formed by the outer peripheral surface of the core member and the opposite end surfaces of the heater member, the ceramic heater main body is pre-fired through a ceramic paste so as to fill the recesses at predetermined positions in the axial direction of the ceramic heater body. A ceramic heater manufacturing method comprising arranging and firing the ceramic molded body. In the manufacturing method of a ceramic heater including a ceramic heater body in which a ceramic heater member having a heating element is wound around the outer periphery of a pipe-shaped ceramic core member,
Of the recesses formed by the outer peripheral surface of the core member and the opposite end surfaces of the heater member, a ceramic paste is filled in a recess at a predetermined position in the axial direction of the ceramic heater body so as to fill the recess, and fired. A method for manufacturing a ceramic heater, comprising: In the manufacturing method of a ceramic heater provided with a ceramic heater body in which a ceramic heater member having a heating element is wound around the outer periphery of a pipe-shaped ceramic core member,
After the heater member is formed by firing, the recess is formed in a recess at a predetermined position in the axial direction of the ceramic heater body among the recesses formed by the outer peripheral surface of the core member and the opposite end surfaces of the heater member. A method for manufacturing a ceramic heater, comprising filling a heat-resistant resin or a resin added with a ceramic material so as to be filled. In the manufacturing method of a ceramic heater provided with a ceramic heater body in which a ceramic heater member having a heating element is wound around the outer periphery of a pipe-shaped ceramic core member,
After the heater member is formed by firing, the recess is formed in a recess at a predetermined position in the axial direction of the ceramic heater body among the recesses formed by the outer peripheral surface of the core member and the opposite end surfaces of the heater member. A method of manufacturing a ceramic heater, wherein a glass material is filled so as to be filled, and the glass material is fired.   The method for manufacturing a ceramic heater according to any one of claims 15 to 18, wherein the predetermined position is an attachment fixing position for fixing an attachment portion used when the ceramic heater body is attached to a heat exchanger. . 20. The method of manufacturing a ceramic heater according to claim 19, wherein after the recess is filled and a shielding member is formed, an attachment portion is attached to the attachment fixing position.

Images